Physics students know that ‘moment = force × distance’, but are you always sure which force and which distance to use? Examiners will set questions to test how far your ideas will take you. In the case of this question, the examiners reported that very few students used the method they had expected for part b and, whichever method was used, this part of the question was poorly answered.
The question is taken from the June 2016 Edexcel Core Physics I paper, which covers mechanics and electrical circuits. The question is reproduced by kind permission of Pearson Education Ltd (Edexcel). The answers that follow are the responsibility of PHYSICS REVIEW, and Pearson/Edexcel accepts no responsibility whatsoever for their accuracy or method of working.
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